CLAUDE_CODE_BASALT_COVE
Updated by Alex Sorokoletov
CLAUDE_CODE_BASALT_COVE is a Claude Code environment variable: An internal codename — one of five this stretch (PEWTER_OWL, LANTERN_PRISM, WALNUT_SPIRE, and a PEWTER_OWL_TOOL). Named flags with no changelog entry are features staged in the code ahead of announcement. Worth watching which of these graduate into real product names. Added between v2.1.143 and v2.1.212 and still present in v2.1.294. It is not in the official reference.
| Status | Present in v2.1.294 |
|---|---|
| Added | Added between v2.1.143 and v2.1.212 |
| Category | Other |
| Official docs | Not listed |
How to set it
For one session, export it in the shell that starts Claude Code:
export CLAUDE_CODE_BASALT_COVE=<value>
claudeTo apply it to every session, add it to the env object of a settings file:
// ~/.claude/settings.json
{
"env": {
"CLAUDE_CODE_BASALT_COVE": "<value>"
}
}Release notes that mention it
Related variables
ANTHROPIC_BETAS: Comma-separated beta feature headers.ANTHROPIC_CUSTOM_HEADERS: Custom HTTP headers (newline-separated Key: Value).ANTHROPIC_FEDERATION_RULE_IDANTHROPIC_ORGANIZATION_IDANTHROPIC_WORKSPACE_IDBETA_TRACING_ENDPOINT: Custom endpoint for beta tracing.CLAUDE_AFK_COUNTDOWN_MSCLAUDE_AI_ORIGIN: Overrides the base URL for Claude AI authentication endpoints.
Frequently asked questions
What does CLAUDE_CODE_BASALT_COVE do?
An internal codename — one of five this stretch (PEWTER_OWL, LANTERN_PRISM, WALNUT_SPIRE, and a PEWTER_OWL_TOOL). Named flags with no changelog entry are features staged in the code ahead of announcement. Worth watching which of these graduate into real product names.
Which Claude Code version has CLAUDE_CODE_BASALT_COVE?
Added between v2.1.143 and v2.1.212 and still present in v2.1.294.
How do I set CLAUDE_CODE_BASALT_COVE?
Export it before starting Claude Code (export CLAUDE_CODE_BASALT_COVE=value), or add it to the "env" object in ~/.claude/settings.json to apply it to every session.
All variables, searchable: Claude Code environment variables.